{"id":"CVE-2026-67222","title":"RabbitMQ is a messaging and streaming broker","summary":"RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400","CWE-770"],"vendor":"broadcom","product":"rabbitmq_server","affected":["rabbitmq_server >= 3.13.0, < 3.13.15","rabbitmq_server >= 4.0.0, < 4.0.20","rabbitmq_server >= 4.1.0, < 4.1.11","rabbitmq_server >= 4.2.0, < 4.2.6"],"patched":["rabbitmq_server 4.2.6"],"published":"2026-09-25","updated":"2026-10-15","sourceUpdated":"2026-10-15T20:01:46.570","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67222","references":[{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-85jr-6rr2-j73r","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67222.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-67222"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541498"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67222"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67222"},{"url":"https://access.redhat.com/errata/RHSA-2026:67552"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00318,"epssPercentile":0.24608,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-28T13:46:20.340797Z"},"scores":{"nvd":6.5,"cna":5.9,"vendor":4.9},"ingestedAt":"2026-09-25T17:13:14.031Z","slug":"CVE-2026-67222","body":"## Overview\n\nRabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.\n\n## Affected\n\n- `rabbitmq_server >= 3.13.0, < 3.13.15`\n- `rabbitmq_server >= 4.0.0, < 4.0.20`\n- `rabbitmq_server >= 4.1.0, < 4.1.11`\n- `rabbitmq_server >= 4.2.0, < 4.2.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `rabbitmq_server 4.2.6`\n\n## Vendor advisories\n\n- **RHSA-2026:67552** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67552)\n- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0 · no fix planned: Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat Hardened Images, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67222.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":230119,"id":"CVE-2026-67222","ts":1793124792678,"field":"cvss","old":"5.9","new":"6.5"}]}